Kimi ga Kemono ni Nareru made

Aki, a swinger college student who is a Sub, feels an unidentified strong gaze during his play. It is Dom's "eyes of a beast" that make Subs kneel from their dominating glare. Since then, he has not been able to forget those eyes.
Mitsuru, Aki's younger childhood friend who is a Normal, has always had feelings for Aki, even if he's aware that "Subs and Normals won't make a balanced relationship."
Aki decides to do a part-time job for a clinical trial of a suppressant drug to pay for his college tuition and begins to look for a Dom who will live with him for two months. Mitsuru finds out and asks him to stay, but he's looking at Aki with the unforgettable "eyes of a beast"...!?

"...I said it, didn't I? I'm going to make you obey me."

(Source: Takeshobo, translated)

Note: Chapter count includes an extra chapter.